Idaho River Map (PDF) | Major Rivers & Lakes in Idaho

Written and Fact-checked by 青青草视频 Editors | Updated On: April 03, 2026 | 15:05 ET

Idaho River Map showing major rivers in Idaho, River start and end point, county boundaries.

River Map of Idaho State

About Map: Idaho River Map showing major rivers in Idaho, county boundaries and state boundary.

PDF Map - Free Download Idaho River Map, United States

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Rivers and Waterways in Idaho

Idaho鈥檚 river systems are shaped by rugged mountains, deep canyons, and high desert landscapes. Most rivers in the state drain westward into the Snake River, which ultimately flows into the Columbia River and the Pacific Ocean. Northern Idaho features forested waterways connected to the Columbia system, while southern regions rely on irrigation-fed rivers and reservoirs. Snowmelt from the Rocky Mountains is a primary source of water, and numerous lakes and reservoirs support agriculture, hydropower, and recreation throughout the state.

Major Rivers in Idaho

River	Length (Approx.)	Region	Flows Into
Snake River	1,078 mi	South	Columbia River
Salmon River	425 mi	Central	Snake River
Clearwater River	74 mi	North	Snake River
Kootenai River	485 mi	North	Columbia River
Boise River	102 mi	Southwest	Snake River
Payette River	82 mi	Southwest	Snake River
Weiser River	103 mi	West	Snake River
Bear River	491 mi	Southeast	Great Salt Lake
Portneuf River	124 mi	Southeast	Snake River
Bruneau River	153 mi	Southwest	Snake River
Owyhee River	346 mi	Southwest	Snake River
St. Joe River	140 mi	North	Lake Coeur d'Alene
Coeur d'Alene River	37 mi	North	Lake Coeur d'Alene
Palouse River	167 mi	North	Snake River
Little Salmon River	51 mi	Central	Salmon River
Blackfoot River	135 mi	Southeast	Snake River
Henrys Fork	135 mi	East	Snake River
Malad River	97 mi	Southeast	Bear River

Major Lakes in Idaho

Lake	Type	Region
Lake Coeur d'Alene	Natural lake	North
Pend Oreille Lake	Natural lake	North
Bear Lake	Natural lake	Southeast
American Falls Reservoir	Reservoir	Southeast
Cascade Lake	Reservoir	Central
Lucky Peak Lake	Reservoir	Southwest
Lake Lowell	Reservoir	Southwest
Redfish Lake	Natural lake	Central
Payette Lake	Natural lake	Central
Dworshak Reservoir	Reservoir	North

Major River Basins in Idaho

Idaho鈥檚 river basins are largely part of the Columbia River system, with the Snake River serving as the main drainage route across the state. Smaller basins in the southeast drain into the Great Basin, creating a mix of interconnected and inland water systems.

Snake River Basin
Salmon River Basin
Clearwater River Basin
Kootenai River Basin
Boise River Basin
Payette River Basin
Owyhee River Basin
Bear River Basin
Bruneau River Basin

Idaho Rivers Facts

State	Idaho
Total Rivers & Streams	107,000+ miles of streams
Major Rivers	Snake, Salmon, Clearwater, Kootenai
Total Waterway Length	110,000+ miles
Main Drainage	Columbia River System
Longest River	Snake River
Shortest River	Coeur d'Alene River
Major River Basins	9 Primary Basins
Primary Outlet	Pacific Ocean
Key Uses	Irrigation, hydropower, recreation, water supply
Longest River Within State	Salmon River
Number of River Basins	8鈥�10 Basins
Major Reservoirs	American Falls, Dworshak, Lucky Peak
Primary Water Source	Snowmelt and surface water

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